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1. At the crank position sensor, check for battery voltage to be present on the Red wire with the key on and cranking. The Black wire should be a good ground and the Blue wire should have 5 volts on it from the computer. One may have to disconnect the crank sensor to check for the 5 volt reference. 2. During crank look for a good 5 volt square wave signal on the Blue wire. 3. Check at the ignition coils for good battery voltage key on and cranking. If there is a loss of voltage during crank check the ignition failsafe relay. 4. Check for any stored engine codes. Crankshaft Position (CKP) Sensor Ignition Failsafe Sensor The ignition failsafe sensor supplies battery voltage to the ignition coils. The ignition coils can look like they have good battery voltage key on but during crank the ignition failsafe relay can stop sending voltage to the ignition coils.

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FORD: 2004-2005 Thunderbird, Explorer LINCOLN: 2004-2005 LS, Aviator MERCURY: 2004-2005 Mountaineer This article supersedes TSB 05-15-4 to correct the Service Procedure. ISSUE Some 2004-2005 vehicles built prior to 09/23/2004 and equipped with the 5R55S transmission, may exhibit a delayed or harsh reverse engagement. This condition may be due to improper pressure control. ACTION It may be necessary to replace the solenoid body assembly. Refer to the following Service Procedure. SERVICE PROCEDURE NOTE INSTALLING TRANSMISSION ADDITIVE WILL PREVENT THE SYMPTOM ON SOLENOIDS THAT DO NOT YET EXHIBIT THE CONDITION BUT WILL NOT RESOLVE THE CONDITION IF IT ALREADY EXISTS. LINCOLN LS AND THUNDERBIRD ONLY 1. Lower the transmission cross member and transmission to gain access to the pressure control solenoid-C (PCC) port. DO NOT disconnect the drive shaft. 2. Install pressure gauge per Step 2 of “DIAGNOSTICS”, below. 3. Reinstall cross member and snug the fasteners for diagnostic purposes only. 4. Proceed with the “DIAGNOSTICS” section of this TSB. 5. After the TSB repair is completed, torque the cross member fasteners to 41 lb-ft (55 N•m). DIAGNOSTICS – ALL VEHICLES 1. Remove pressure tap plug at PCC port (Figure 1).